javascript - PHOTOSHOP/JSX : How to efficiently check if tool was used

Question

我正在尝试创建一个小脚本，它将读取编辑特定图像时执行了多少步骤。同时还要检查使用了哪些工具。然后将所有结果导出到 .csv 中的各个类别中。

我有输出部分。我有历史状态。

但是您如何检查是否使用了特定工具，例如:液化、克隆图章、自由变换等？

我有以下脚本。它会快速检查我是否使用了该工具，但如果没有使用，则会抛出错误:

No such Element. Line: 13
->      var LiquifyUsed = app.activeDocument.historyStates.getByName('Liquify');

var LiquifyUsed = app.activeDocument.historyStates.getByName('Liquify');

//Check if Liquify was used

if (LiquifyUsed = true) {
	alert ("Liquify was used")
} else {
	alert ("It was not used")

Answer 1

简单地捕获异常:

var liquifyUsed = false;
try {
    app.activeDocument.historyStates.getByName('Liquify');
    liquifyUsed = true;
} catch(e) {
    // assume the error is always "No such element" --
    // you could be more fastidious and check instead.
}
alert('Liquify used: ' + liquifyUsed);